The Need For Spooky Music

Spooky music is necessary, especially if your creating a Halloween movie.
Watch these 2 films produced by Disney, both animated by
The Skeleton Dance - Disney Movie 1929
Skeleton Frolic - Disney 1937

Listen to this spooky music played by an orchestra. What instruments do you hear?
Danse Macabre by Saint-Saëns

Mozart also created a somber sounding song:
The Requiem by Mozart